Huh...?
And the water ice on Mars doesn't count???
Re-read the article and compare to the assumption made about hydrogen found on Mars that they assume must be water. They made the same assumptions about the planets atmospheres and came up empty.
They finds 'signs' of water which is very different from finding water.
There is very strong evidence of water on Mars. As for hydrogen, it's all over the place, even in not-so-vacuum of space.